Processes of making paper

Details Processes of making paper Processes of making paper

1997-12-31

1999-09-28

Silverman, Stanley S.

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621681, 162183, 1621641, 162158, 1621872, 1621813, D21H 1745, D21H 1756, D21H 2110, D21H 1766

Patent

active

059581883

ABSTRACT:
Paper is made by a dual soluble polymer process in which a cellulosic suspension which usually contains alum or cationic coagulant is first flocculated with a high intrinsic viscosity cationic synthetic polymer or cationic starch and, after shearing, the suspension is reflocculated by the addition of a branched anionic water soluble polymer having an intrinsic viscosity above 3 dl/g and tan delta at 0.005 Hz of at least 0.5. The process gives an improved combination of formation, retention and drainage.

REFERENCES:
patent: 4925530 (1990-05-01), Sinclair et al.
patent: 5098520 (1992-03-01), Begala
patent: 5167766 (1992-12-01), Honig et al.
patent: 5185062 (1993-02-01), Begala
patent: 5274055 (1993-12-01), Honig et al.
patent: 5393381 (1995-02-01), Hund et al.
patent: 5571380 (1996-11-01), Fallon
patent: 5595629 (1997-01-01), Begala

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